AS18092: the CSF Kyushu Tele Communications Company network

AS18092 is an internet Autonomous System operated by CSF Kyushu Tele Communications Company (Japan). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS18092?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS18092 was assigned to CSF Kyushu Tele Communications Company by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS18092 currently announces 19 IPv4 block(s), totaling about 45.1 thousand addresses (45,056 in all), registered in Japan. Services from CSF Kyushu Tele Communications Company are reached through these addresses.

What it means to see AS18092 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS18092. That means the other end sits on the CSF Kyushu Tele Communications Company network (Japan). It can be legitimate — a cloud service, an ISP, a CDN — or an unexpected connection worth checking.

How to see every connection and network your devices reach

Tracing one connection's ASN at a time is tedious. Sentinela, by PC Monitor, maps the devices on your network, shows what is exposed to the internet and helps flag suspicious connections and devices — running on your Windows. Meet Sentinela.